bluetooth: BluetoothAdapterDeleter used to control BluetoothAdapter destruction.

device/bluetooth/bluetooth_adapter_mac.mm

Index: device/bluetooth/bluetooth_adapter_mac.mm
diff --git a/device/bluetooth/bluetooth_adapter_mac.mm b/device/bluetooth/bluetooth_adapter_mac.mm
index 2d0556d97d0b0d0ee5a7b966d4fb791be089a3c6..522f041e3fb2229265d9c47cef3b6141937dfc30 100644
--- a/device/bluetooth/bluetooth_adapter_mac.mm
+++ b/device/bluetooth/bluetooth_adapter_mac.mm
@@ -164,6 +164,12 @@ void BluetoothAdapterMac::DeviceConnected(IOBluetoothDevice* device) {
   DeviceAdded(device);
 }
 
+void BluetoothAdapterMac::DeleteOnCorrectThread() const {
+  if (ui_task_runner_->RunsTasksOnCurrentThread() ||
+      !ui_task_runner_->DeleteSoon(FROM_HERE, this))
+    delete this;
+}
+
 void BluetoothAdapterMac::AddDiscoverySession(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {